某产品的相对市场占有率为6，市场增长率为16%，该产品属于（）
A.明星类
B.金牛类
C.问题类
D.狗类
参考答案：A
It was several years I finally realized David had lied to me.
A．when;that
B．that;when
C．before;that
D．until;why
常用叶片式水泵类型包括（）。
A.往复泵
B.离心泵
C.轴流泵
D.混流泵
E.旋涡泵
